<p>
  <button id="add" ng-click="$ctrl.addClass()">Add</button>
  <button ng-click="$ctrl.removeClass()">Remove</button>
  <br>
  <button id="cancel" ng-click="$ctrl.cancel()" ng-disabled="!$ctrl.runner">Cancel</button>
  <br>
  <div id="target">CSS-Animated Text</div>
</p>